Blisters When You Walk Higher Miles. Walking 10 miles (over 3 hours), even if you are used to walking for six miles, is more of a challenge. You can do it, but most people are likely to develop blisters in new places. Shoes and gear that worked fine for two hours may not be ideal for four hours.
How the Aurora Borealis occur. The Northern Lights are caused by the interaction of the solar wind - a stream of charged particles escaping the Sun - and our planet's magnetic field and atmosphere.
Northern Lights Iceland best time: more details. The northern lights are a result from emission of photons in the highest altitude â more than 80km up, made by ionized nitrogen regaining an electron, and oxygen and nitrogen atoms coming from an excited level to a more grounded state.